New Motherboards ECC memory and PCI-E issues

I have pretty much decided on a couple of motherboards, but there
are a couple of issues I would like to find out more about:

1. I have ECC memory on one of my current computers, and I had
hoped to have ECC on my next motherboard. I noticed that DDR2
memory with ECC is "non-buffered". I do not understand how you
can have ECC without buffering. Can someone explain this?

Comment on ECC: I cannot understand how "consultants" have
sold computers without ECC to businesses over the years. It
is irresponsible and, I think unprofessional. As for the cost
of ECC memory, if more people bought ECC then the price would
probably fall.

2. PCI-E has been around for a while in 1X, 8X and 16X
slots (an 8X slot being a 16X physical slot but 8X support).
The 4X slots are, from what I gather, actually "new". Looking
at the PCI-E spec, 1X is actually pretty fast. But it
seems to me that there is sort of a trend to the new 4X
slot. It is unclear whether there is any physical reason
why a 16X slot cannot handle a 4X card. It appears to
me that this is a BIOS issue. So far I have not read
anything that indicates that a 16X slot can support a 4X
card. Does anyone know about this? Is it just presumed
that a 16X slot will handle all the smaller cards? If I
buy a board that does not specifically say this, but it
has 2 1X slots and 2 16X slots, does this mean none of those
slots will help me if I buy a 4X card someday?

Thanks for any advice on these issues.

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